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Charge distribution consequences of the magnetic order in TbB6

The antiferromagnetic state of TbB6 has been investigated by way of magnetostriction and X-ray scattering measurements on a single crystal. The magnetostriction data reveal a well defined tetragonal symmetry lowering and a weak volume increase below TN . The X-ray scattering investigation shows charge satellites, related to the (1/2 0 0) and (1/2 1/2 0) wave vectors stars. The (1/2 0 0) satellites are characteristic of exchange displacement waves, similar to those observed in GdB6, whereas the (1/2 1/2 0) ones could result as well from 4f multipolar scattering.

magnetostriction ; X-ray scattering ; TbB6 ; antiferromagnetic

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